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ST10F272Z2 Datasheet(PDF) 42 Page - STMicroelectronics

Part # ST10F272Z2
Description  16-bit MCU with 256 Kbyte Flash memory and 20 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F272Z2 Datasheet(HTML) 42 Page - STMicroelectronics

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Internal Flash memory
ST10F272Z2
42/189
5.6
Write operation examples
In the following, examples for each kind of Flash write operation are presented.
Note:
The write operation commands must be executed from another memory (internal RAM or
external memory), as in ST10F269 device. In fact, due to IBus characteristics, it is not
possible to perform write operation in Flash while fetching code from Flash.
Moreover, direct addressing is not allowed for write accesses to IFlash control registers.
This means that both address and data for a writing operation must be loaded in one of
ST10 GPR register (R0...R15).
Write operation on IBus registers is 16 bit wide.
Example of indirect addressing mode
MOV
RWm, #ADDRESS;
/*Load Add in RWm*/
MOV
RWn, #DATA;
/*Load Data in RWn*/
MOV
[RWm], RWn;
/*Indirect addressing*/
Word program
Example: 32-bit Word Program of data 0xAAAAAAAA at address 0x025554
FCR0H|= 0x2000;
/*Set WPG in FCR0H*/
FARL
= 0x5554;
/*Load Add in FARL*/
FARH
= 0x0002;
/*Load Add in FARH*/
FDR0L = 0xAAAA;
/*Load Data in FDR0L*/
FDR0H = 0xAAAA;
/*Load Data in FDR0H*/
FCR0H|= 0x8000;
/*Operation start*/
Double word program
Example: Double Word Program (64-bit) of data 0x55AA55AA at address 0x035558 and
data 0xAA55AA55 at address 0x03555C in IFLASH Module.
FCR0H
|= 0x1000;
/*Set DWPG/
FARL
= 0x5558;
/*Load Add in FARL*/
FARH
= 0x0003;
/*Load Add in FARH*/
FDR0L
= 0x55AA;
/*Load Data in FDR0L*/
FDR0H
= 0x55AA;
/*Load Data in FDR0H*/
FDR1L
= 0xAA55;
/*Load Data in FDR1L*/
FDR1H
= 0xAA55;
/*Load Data in FDR1H*/
FCR0H
|= 0x8000;
/*Operation start*/
Double Word Program is always performed on the Double Word aligned on a even Word: bit
ADD2 of FARL is ignored.
Sector erase
Example: Sector Erase of sectors B0F1 and B0F0 of Bank 0 in IFLASH Module.
FCR0H
|= 0x0800;
/*Set SER in FCR0H*/
FCR1L
|= 0x0003;
/*Set B0F1, B0F0*/
FCR0H
|= 0x8000;
/*Operation start*/


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